(19)
(11) EP 1 219 853 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
16.07.2003 Bulletin 2003/29

(43) Date of publication A2:
03.07.2002 Bulletin 2002/27

(21) Application number: 01125543.7

(22) Date of filing: 25.10.2001
(51) International Patent Classification (IPC)7: F16F 1/38
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 25.12.2000 JP 2000393527

(71) Applicant: TOYO TIRE & RUBBER CO., LTD .
Nishi-ku, Osaka-shi, Osaka-fu (JP)

(72) Inventors:
  • Kawada, Michihiro
    Nishiku, Osaka (JP)
  • Takahashi, Hiroaki
    Nishiku, Osaka (JP)
  • Tadano, Hideo
    Nishiku, Osaka (JP)

(74) Representative: Leson, Thomas Johannes Alois, Dipl.-Ing. 
Tiedtke-Bühling-Kinne & Partner GbR, TBK-Patent, Bavariaring 4
80336 München
80336 München (DE)

   


(54) Method of producing vibration-isolating bushing


(57) A method of producing a vibration-isolating bushing with which it is possible to secure a larger area of the edge surface of an inner cylinder than in the prior art method. In upsetting one extremity (18a) of the inner cylinder (12) by cold plastic working, after a rubber elastomer (16) is secured to the outer circumference of the inner cylinder by vulcanization molding, as a jig for pressing onto the edge surface of the inner cylinder, an upsetting jig (30) whose top surface (32) is flat is used and the top surface (32) of the jig (30) is pressed onto the edge surface (20a) of the inner cylinder (12) while causing the jig to gyrate on a conical orbit centering the axis (x0) of the inner cylinder (12), whereby the outside diameter only of the extremity (18a) is enlarged while suppressing the enlarging of the inside diameter.






Search report